The main
objective of the study was set to model point-and-select task on graphical
elements (targets) to predict

 user performance in touch in mobile screen
movements using Fitts’ paradigm. This part of the study tests few

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 hypotheses to set a direction to facilitate
pointing task by changing Fitts’ two parameters (distance and width of a

 target). Results are analyzed to gain the
techniques of designing graphical user interface for the improvement of

human pointing
performance using mobile touch screen.

and Interface Design:

           When human interact with mobile, physical behavior
of the user and the interface perform a task, thus an

 interface has been design to focus on user


                                20 volunteers,
of different gender and age participated in target pointing experiment. Similar

original experiment, participants did reciprocal pointing on pair of horizontal
square shape target with touch

mobile. Interested Participants are performing as quickly as possible.


performed 27 trial on “point-select” task. When volunteers, touch the button
that time is

 save in database, form hare 27 touch, complete
a volunteer’s activity.


                               Experiment are conducted in a 5′
Android mobile phone with a screen size. Full screen size is

 360pix wide. Every android device is the commonly
used pointing device by user, this study used an android 

phone in the experiment because the data collected form an absolute positioning
device corresponds more

more reliably to physical limb movements, potentially allowing for more kinds
of analysis.


Task in this
study is like traditional Fitts reciprocal tapping task. Task are design in
three levels, each levels has three tasks. Target amplitude and target width
designed in three levels as well, each level has three different target amplitude
and target width combination. The Task, target amplitude and width were
controlled variable. Movement time was measured form the beginning of a touch
of a button. The order of the nine width(w) and distance(D) were considered to
give different task difficulties.3 trial were presented in each W, D
combination. The first click was excluded in analysis. There are use of three
levels for target amplitude and target width (A=80, 160, & 240 units; W=18,
36, & 72 units) resulting in IDs from 1 to 5 bits. If the user clicks did
not successfully select the target, the occurrence and time of the error were
not recorded and the trial was not terminated. 
The experiment was sequenced by trials, blocks, and sessions. Each trial
was a single point-select task; each block was a series of 3 trials; each
session was a series of 3 blocks covering, a systematic order, and the 9
combinations of target amplitude and target width. The total trial can be
computed as follows-


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